From 657cbb6b6cba0f9c98c5299e0c803b2c0e67ea0a Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Mon, 23 Nov 2009 15:26:46 +0100 Subject: x86/amd-iommu: Use dev->arch->iommu to store iommu related information This patch changes IOMMU code to use dev->archdata->iommu to store information about the alias device and the domain the device is attached to. This allows the driver to get rid of the amd_iommu_pd_table in the future. Signed-off-by: Joerg Roedel --- arch/x86/include/asm/amd_iommu_types.h | 8 +++ arch/x86/include/asm/device.h | 2 +- arch/x86/kernel/amd_iommu.c | 109 ++++++++++++++++++++++++++------- 3 files changed, 95 insertions(+), 24 deletions(-) (limited to 'arch/x86') diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h index 02b6a0fd863..9eaa27b4686 100644 --- a/arch/x86/include/asm/amd_iommu_types.h +++ b/arch/x86/include/asm/amd_iommu_types.h @@ -247,6 +247,14 @@ struct protection_domain { }; +/* + * This struct contains device specific data for the IOMMU + */ +struct iommu_dev_data { + struct device *alias; /* The Alias Device */ + struct protection_domain *domain; /* Domain the device is bound to */ +}; + /* * For dynamic growth the aperture size is split into ranges of 128MB of * DMA address space each. This struct represents one such range. diff --git a/arch/x86/include/asm/device.h b/arch/x86/include/asm/device.h index cee34e9ca45..029f230ab63 100644 --- a/arch/x86/include/asm/device.h +++ b/arch/x86/include/asm/device.h @@ -8,7 +8,7 @@ struct dev_archdata { #ifdef CONFIG_X86_64 struct dma_map_ops *dma_ops; #endif -#ifdef CONFIG_DMAR +#if defined(CONFIG_DMAR) || defined(CONFIG_AMD_IOMMU) void *iommu; /* hook for IOMMU specific extension */ #endif }; diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index ed58a168839..3214e8806f9 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -73,6 +73,11 @@ static inline u16 get_device_id(struct device *dev) return calc_devid(pdev->bus->number, pdev->devfn); } +static struct iommu_dev_data *get_dev_data(struct device *dev) +{ + return dev->archdata.iommu; +} + /* * In this function the list of preallocated protection domains is traversed to * find the domain for a specific device @@ -128,6 +133,35 @@ static bool check_device(struct device *dev) return true; } +static int iommu_init_device(struct device *dev) +{ + struct iommu_dev_data *dev_data; + struct pci_dev *pdev; + u16 devid, alias; + + if (dev->archdata.iommu) + return 0; + + dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL); + if (!dev_data) + return -ENOMEM; + + devid = get_device_id(dev); + alias = amd_iommu_alias_table[devid]; + pdev = pci_get_bus_and_slot(PCI_BUS(alias), alias & 0xff); + if (pdev) + dev_data->alias = &pdev->dev; + + dev->archdata.iommu = dev_data; + + + return 0; +} + +static void iommu_uninit_device(struct device *dev) +{ + kfree(dev->archdata.iommu); +} #ifdef CONFIG_AMD_IOMMU_STATS /* @@ -1346,28 +1380,39 @@ static void clear_dte_entry(u16 devid) static int __attach_device(struct device *dev, struct protection_domain *domain) { - u16 devid = get_device_id(dev); - u16 alias = amd_iommu_alias_table[devid]; + struct iommu_dev_data *dev_data, *alias_data; + u16 devid, alias; + + devid = get_device_id(dev); + alias = amd_iommu_alias_table[devid]; + dev_data = get_dev_data(dev); + alias_data = get_dev_data(dev_data->alias); + if (!alias_data) + return -EINVAL; /* lock domain */ spin_lock(&domain->lock); /* Some sanity checks */ - if (amd_iommu_pd_table[alias] != NULL && - amd_iommu_pd_table[alias] != domain) + if (alias_data->domain != NULL && + alias_data->domain != domain) return -EBUSY; - if (amd_iommu_pd_table[devid] != NULL && - amd_iommu_pd_table[devid] != domain) + if (dev_data->domain != NULL && + dev_data->domain != domain) return -EBUSY; /* Do real assignment */ if (alias != devid && - amd_iommu_pd_table[alias] == NULL) + alias_data->domain == NULL) { + alias_data->domain = domain; set_dte_entry(alias, domain); + } - if (amd_iommu_pd_table[devid] == NULL) + if (dev_data->domain == NULL) { + dev_data->domain = domain; set_dte_entry(devid, domain); + } /* ready */ spin_unlock(&domain->lock); @@ -1406,10 +1451,12 @@ static void __detach_device(struct device *dev) { u16 devid = get_device_id(dev); struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; + struct iommu_dev_data *dev_data = get_dev_data(dev); BUG_ON(!iommu); clear_dte_entry(devid); + dev_data->domain = NULL; /* * If we run in passthrough mode the device must be assigned to the @@ -1439,18 +1486,23 @@ static void detach_device(struct device *dev) static struct protection_domain *domain_for_device(struct device *dev) { struct protection_domain *dom; + struct iommu_dev_data *dev_data, *alias_data; unsigned long flags; u16 devid, alias; - devid = get_device_id(dev); - alias = amd_iommu_alias_table[devid]; + devid = get_device_id(dev); + alias = amd_iommu_alias_table[devid]; + dev_data = get_dev_data(dev); + alias_data = get_dev_data(dev_data->alias); + if (!alias_data) + return NULL; read_lock_irqsave(&amd_iommu_devtable_lock, flags); - dom = amd_iommu_pd_table[devid]; + dom = dev_data->domain; if (dom == NULL && - amd_iommu_pd_table[alias] != NULL) { - __attach_device(dev, amd_iommu_pd_table[alias]); - dom = amd_iommu_pd_table[devid]; + alias_data->domain != NULL) { + __attach_device(dev, alias_data->domain); + dom = alias_data->domain; } read_unlock_irqrestore(&amd_iommu_devtable_lock, flags); @@ -1473,14 +1525,12 @@ static int device_change_notifier(struct notifier_block *nb, devid = get_device_id(dev); iommu = amd_iommu_rlookup_table[devid]; - domain = domain_for_device(dev); - - if (domain && !dma_ops_domain(domain)) - WARN_ONCE(1, "AMD IOMMU WARNING: device %s already bound " - "to a non-dma-ops domain\n", dev_name(dev)); switch (action) { case BUS_NOTIFY_UNBOUND_DRIVER: + + domain = domain_for_device(dev); + if (!domain) goto out; if (iommu_pass_through) @@ -1488,6 +1538,11 @@ static int device_change_notifier(struct notifier_block *nb, detach_device(dev); break; case BUS_NOTIFY_ADD_DEVICE: + + iommu_init_device(dev); + + domain = domain_for_device(dev); + /* allocate a protection domain if a device is added */ dma_domain = find_protection_domain(devid); if (dma_domain) @@ -1502,6 +1557,10 @@ static int device_change_notifier(struct notifier_block *nb, spin_unlock_irqrestore(&iommu_pd_list_lock, flags); break; + case BUS_NOTIFY_DEL_DEVICE: + + iommu_uninit_device(dev); + default: goto out; } @@ -2079,6 +2138,8 @@ static void prealloc_protection_domains(void) if (!check_device(&dev->dev)) continue; + iommu_init_device(&dev->dev); + /* Is there already any domain for it? */ if (domain_for_device(&dev->dev)) continue; @@ -2270,6 +2331,7 @@ static void amd_iommu_domain_destroy(struct iommu_domain *dom) static void amd_iommu_detach_device(struct iommu_domain *dom, struct device *dev) { + struct iommu_dev_data *dev_data = dev->archdata.iommu; struct amd_iommu *iommu; u16 devid; @@ -2278,7 +2340,7 @@ static void amd_iommu_detach_device(struct iommu_domain *dom, devid = get_device_id(dev); - if (amd_iommu_pd_table[devid] != NULL) + if (dev_data->domain != NULL) detach_device(dev); iommu = amd_iommu_rlookup_table[devid]; @@ -2293,7 +2355,7 @@ static int amd_iommu_attach_device(struct iommu_domain *dom, struct device *dev) { struct protection_domain *domain = dom->priv; - struct protection_domain *old_domain; + struct iommu_dev_data *dev_data; struct amd_iommu *iommu; int ret; u16 devid; @@ -2301,14 +2363,15 @@ static int amd_iommu_attach_device(struct iommu_domain *dom, if (!check_device(dev)) return -EINVAL; + dev_data = dev->archdata.iommu; + devid = get_device_id(dev); iommu = amd_iommu_rlookup_table[devid]; if (!iommu) return -EINVAL; - old_domain = amd_iommu_pd_table[devid]; - if (old_domain) + if (dev_data->domain) detach_device(dev); ret = attach_device(dev, domain); -- cgit v1.2.3